Spectral-weight-tunable weak light magnitude simulation system

Abstract

The invention relates to a spectral-weight-tunable weak light magnitude simulation system. The system comprises a spectral-weight-tunable spectral simulation subsystem and a large-caliber stray light-eliminating star simulator subsystem arranged on an outgoing light path of the spectral-weight-tunable spectral simulation subsystem. The spectral-weight-tunable weak light magnitude simulation system provided by the invention has the advantages of large caliber, stray light elimination and high measurement accuracy.

Description

technical field [0001] The invention belongs to the technical field of optical detection, and relates to a magnitude simulator system, in particular to a large-aperture, stray light-eliminating, faint-light star magnitude simulation system with adjustable spectral weight. Background technique [0002] In deep space exploration and astronomical observation, in order to detect stars with weak brightness or farther away from the earth, it is necessary to develop some high-sensitivity detection cameras, and this detection camera has a strong detection ability, and there is no effective standard test in China equipment to calibrate its detection capabilities. For conventional detection cameras, the following two methods are usually used in China to calibrate the detection capabilities of detection cameras: one is to take pictures of internationally recognized stars with known magnitudes in the mountains far away from the city, and then the collected data Perform processing to co...

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Problems solved by technology

The disadvantages of this method are: ① affected by natural conditions and weather, sometimes waiting for dozens of days may not necessarily wait for the weather to meet the experimental conditions; ② affected by the absorption of the spectrum by the atmosphere, the measurement accuracy of atmospheric density and the atmospheric transmittance ③ due to the non-uniform absorption of the star radiation spectrum by the atmosphere, the spectral distribution received by the detection camera is different from the actual radiation spectral distribution of the star; Stray light makes the background of the detection camera brighter, and the faint target information is submerged in the dark background; another calibration method is to use a star simulator to simulate an infinite star point in the laboratory to complete the calibration of the detection capability of the detection camera. Not affected by weather conditions, the implementation is relatively simple, but this method also has many shortcomings: ①Since the stray light of the star simulator itself is difficult to eliminate, it cannot simulate higher magnitude stars; ②At present, the effective aperture of the star simulator in China is small , cannot complete the calibration task of the large-aperture detection camera; ③The simulation spectrum is single, that is, the laboratory can only simulate the radiance of the star, but cannot simulate the radiation spectrum distribution of the star, resulting in inaccurate calibration of the detection camera

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